Quadruple sound output loudspeaker enclosure



June 30, 1970 P. D. BRoUssARD 3,517,769

QUADRUPLE SOUND OUTPUT LOUDSPEAKER ENCLOSURE Filed March 2e, 1969 UnitedStatesl Patent Cilce 3,517,769 Patented June 30, 1970 3,517,769QUADRUPLE SOUND GUTPUT LOUDSPEAKER ENCLOSURE Paul Daniel Broussard,Andrew, La. (Rte. 2, Box 271, Kaplan, La. 70548) Filed Mar. 26, 1969,Ser. No. 810,503 Int. Cl. G10k 13/00; H04r 7/00 U.s cl. 181-31 7 claimsABSTRACT F THE DISCLOSURE The present invention relates to my new andimproved loudspeaker enclosure for increasing enclosure eiliciency andoutput, and suitable for high fidelity audio reproduction.

In the accompanying drawings:

FIG. 1 is a front plan view of the loudspeaker enclosure with its frontgrille removed;

FIG. 2 is an inner view illustrated from the top of the loudspeakerenclosure with its top member or panel removed;

FIG. 3 is a cross section through 1-1 of FIG. l;

FIG. 4 is a cross section through 2-2 of FIG. l; and

FIG. 5 is an enlarged cross section through 3-3 of FIG. 2.

Referring to the drawing, the present loudspeaker enclosure is comprisedof a loudspeaker in FIGS. 2 and 3, a back or rear wall 11 in FIGS. 2, 3,and 4, a top 12, and a bottom 13 in FIGS. 1, 3, and 4.

The loudspeaker 10 is mounted to a ported baille 14 in FIGS. 1,` 2, 3,and 4, the front grille 15 is shown by dashed lines in FIGS. 2, 3, and4, the carrying handles 16 and 17 are shown in FIG. 1, the glides orcasters 18 are shown in FIGS. l, 2, and 4, and the loudspeaker 10 isconnected by a hookup cable 42 to a suitable jack 19 in FIG. 2.

The present enclosure also comprises of a loudspeaker bridge 20 in FIGS.2 and 3, which is lightly secured t0 the loudspeaker cone 41, such aswith any suitable adhesive. The said bridge 20 may be a relatively rigidT- shaped or similar member made of plastic, wood or any suitablematerial, employed to transmit the loudspeaker cone 41 movement to amembrane or diaphragm 21, which may be made of thin plastic,polyethylene, or any suitable material, stretched between a fixedmounting member 22 and an adjustable mounting member 23 in FIGS. 2 and3.

Secured to the ilexible membrane 21 is a second membrane or diaphragm 24which may be made of thin material, but which is preferably slightlyharder than the ilexible membrane 21, such as plastic laminate, employedto transmit the loudspeaker cone 41 vibrations to all areas of the lrstmembrane 21 as in FIGS. 2 and 3.

As illustrated in FIGS. l and 2, member 23, which supports and tensionsthe iirst membrane 21, is held in place at one end by a fixed support 25in FIG. 2. Whereas, the other end of the said member 23 is linked to andsupported by an adjustable member 26. The adjustable member 26 may be anadjustable guitar tuning gear or any suitable adjusting means mountedand passing through an enclosure cabinet side 27, such as through aguitar tuning gear insert 28, into member 23, where a suitable lpin 29links the guitar machine gear 26 to the member 23 as in FIG. 5.Therefore, by rotating the knob 40 on the adjusting 4means 26 in FIGS.1, 2, and 5, the tension upon the flexible membrane 21 in FIGS. 1, 2,and 3 may be adjusted and regulated. As in FIGS. l and 2, the enclosurealso comprises of a second side member or panel 38.

Since the operation of a loudspeaker is readily understood in the art,its operation will not be discussed in detail, except to be understoodthat the cone 41 of any loudspeaker 10 will move forward and backward,assuming an instrument is connected to and played through the jack 19 inFIGS. 1 and 2.

The present loudspeaker 10 is mounted to a ported baille 14, thus saidbaille has a port hole 39 in FIGS. 1, 2, and 4, for sound refraction topass through. Furthermore, the ported baille 14 is not placed parallelto the front nor back of the enclosure, but rather at an angle,preferably, between two and fifty degrees from parallel to the enclosureback or rear wall 11 as indicated by 30 in FIG. 2, causing the soundrefraction or background movement of the loudspeaker cone 41 to reilectsound toward and through the port hole 39, in the baille 14, as shown by35 in FIGS. 2 and 4.

In FIG. 4, above and below the port hole 39, in the baille 14, are portbaille plates 31 and 32, which are placed at an angle indicated by 33and 34, to direct the propagated sound waves back through the port hole39. The angle of the baille plates 31 and 32, preferably, should bebetween two and fifty degreesfrom parallel to the baille 14, to redirectthe sound waves above and below the port hole 39, in the baille 14, backthrough the port hole 39. Therefore, the sound refraction of the backside of the loudspeaker cone 41 in FIG. 2 follows the path indicated by35 in FIGS. 2 and 4.

When the loudspeaker cone 41 moves forward, the sound waves produced bythe cone 41 takes the path indicated by 36 in FIG. 2. Furthermore, asthe loudspeaker cone 41 moves forward, this causes the loudspeakerbridge 20, as well as the membranes 21 and 24 to be set into motion.Thus, the membranes 21 and 24 also produce sound just as does theloudspeaker cone 41, except the membranes 21 and 24 have a much largervibrating area, and greatly increase the eiliciency and output of theloudspeaker 10y in FIGS. 2 and 3.

The backward movement of membranes 21 and 24 in FIG. 2, cause sound toalso take the path indicated by 36. Whereas, the forward motion ofmembranes 21 and 24 cause sound to move as indicated by 37 in FIG. 2.Hence, due to having both the loudspeaker cone 41 forward and Iback-wardmovement, and the forward and backward movement of membranes 21 and 24causes quadruple sound output.

The present enclosure may include an outer covering which was notillustrated. Furthermore, only one loudspeaker is illustrated, however,more than one loudspeaker may be utilized if desired.

The foregoing is considered as illustrative of the prin- .ciples of theinvention, further, since modiiications and rear wall, a loudspeakermounted therein to a parted bafe which is disposed at an angle fromparallell to thehrear wall of the enclosure, va tensioned ilexiblernembrane'or diaphragm mounted in said enclosure vand spaced forwardlyfrom the said loudspeaker, anda bridge secured to the loudspeaker coneand contacting the said mein@ bran'e. 2. The invention dened in claim 1,wherein the ported baille is mounted betweentwo and fifty degrees from'vparallelto` the rear wall. s

3. The invention defined inA claim 1, `wherein baille ,Y I

plates are secured above and below the port hole in the baille anddisposed at an angle from parallel to the baille.

4. The invention defined in claim v3, wherein the port baille plates aremounted between two and fifty degrees from parallel to the baillle. v

5. The invention defined in claim 1, wherein means coupling the bridgeand the membrane comprising an- 20 ...Qtherlesetible .mmebrane Secured.to.. the tensione@ ilexible membrane. 6. The invention denedrin claim 1,wherein the tensioned membrane is substantially parallel to said rearwall.

7. The invention defined in claim 1, wherein the ilexiblemembrane istensioned between a xed support land an adjustable support..

y References Cited yAnastin v181-31 STEPHEN J. ToMsKY, Primary/'Examiner`U.s. C1. X.R.

UNITED STATES PATENT oEEICE CERTIFICATE 0F CORRECTION Patent No.3,517,769 June 30, 1970 Paul Danlel Broussard It is certified that errorappears in the above identified patent and that said Letters Patent arehereby corrected as shown below:

Column 3, line 3, "parted" should read ported Signed and sealed this16th day of March 1971.

(SEAL) Attest:

Edward M. Fletcher, J r.

Commissioner of Patents Attesting Officer WILLIAM E. SCHUYLER, JR.

